Manual abstract:
thomsontechnology.com BCM 1220 BATTERY CHARGER 1. INSTALLATION Ensure that the battery charger is securely installed in a dry location where it
will receive adequate ventilation. The ambient air temperature around the battery should not exceed 40°C. Connect a 120VAC or 240VAC, 50/60Hz, 15AAC
supply circuit, c/w grounding conductor, to the battery charger supply terminals. Note: The internal transformer is reconnectable with jumpers for 120 or
240VAC input. Caution: The charger is supplied for 120 VAC input as standard. Connect the DC output to the battery to be charged. Excessively long or
undersized DC leads will reduce the battery charger's output and will increase the time required to re-charge the battery. It is essential to observe the DC
polarity.
Ensure that all electrical connections are made in accordance with the applicable regulatory authorities. CAUTION! Batteries may produce explosive gases
when being charged. Do not make electrical sparks or introduce It is flame of any kind in vicinity of a battery. from the battery and charger during
recommended that all electrical loads be disconnected adjustment procedures. Always isolate the charger from the supply and the battery before making any
electrical connections or adjustments.
All servicing procedures should be Dangerous undertaken by a qualified technician only. injury or death. voltages are present within the charger which may
cause 2. FLOAT & EQUALIZE MODES NOTE: If the charger is equipped with an APB 1210 alarm/control module, please refer to section 6. The charger
has been factory adjusted for correct "float" and "equalize" voltage levels for standard lead-acid batteries.
The selection of "float" or "equalize" is controlled by the "float/equalize" switch or an optional manual equalize timer. The "float" voltage is adjusted to a
specific voltage in order to maintain the battery in a fully charged condition. This is the normal mode for continuous operation. The "equalize" voltage is
adjusted to a specific voltage higher than "float". A battery should be "equalized" periodically in order to ensure that all cells are equally and fully charged.
In either "float" or "equalize" mode, the charger will automatically adjust its output current between zero and full output as required to maintain the correct
voltage. PM004 Rev 2 00/09/21 1 Thomson Technlogy BCM 1220 BATTERY CHARGER WARNING: Never leave the switch in the "equalize" Excessive
"equalize" position for long periods of time (6 hours per month is adequate for most installations). charging will cause cells to gas (through electrolysis) and
consume excessive quantities of electrolyte. Never let the electrolyte level drop below the minimum level line of the battery. Factory preset levels (for lead-
acid batteries): Battery Voltage 12VDC Nominal 24VDC Nominal Float 13.
5 27.0 Equalize 14.5 29.0 Current Limit is set at 100% of nameplate rating. 3. OUTPUT ADJUSTMENTS 3.1. "FLOAT" VOLTAGE ADJUSTMENT
CAUTION! Do not leave battery charger energized if the current output exceeds the unit nameplate rating. If necessary re-adjust the battery charger's current
limit setting before adjusting float/equalize settings. 3.
1.1. Attach a precision voltmeter of the correct range in parallel with the battery. (Accuracy should be better than +/- 0.5%.
) 3.1.2. Switch the charger's switch to "float". equalize charge until the timer times out.
) 3.1.3. Wait until the battery voltage stabilizes. (The output current should be almost zero, unless a load is also connected to the battery. This may take many
hours!) 3.1.4. If the voltage is incorrect adjust the float potentiometer located on the printed circuit card. Turn the adjusting screw clockwise to increase
voltage, and counterclockwise to reduce voltage.
Adjust in small increments, allowing voltage to stabilize after each adjustment. (If the float adjustment is changed, it will be necessary to recalibrate the
equalize adjustment also.) (If the charger is equipped with an automatic timer, the timer may have the unit in equalize.
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BCM 1220 user guide
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